Diagnostics

FCT

Fast Current Transformer

Most sensitive & fastest current transformer

Best non-destructive instrument to observe

pulsed or CW beams

Bandwidth

Up to 2 GHz

Rise time

< 200 ps

Application

Used world-wide on all high-energy particle accelerators to observe very short beam pulses. Exceptional bandwidth and sensitivity are achieved by using amorphous cobalt- based alloy cores specially annealed in a magnetic field to obtain very high permeability and low loss at frequencies up to 2 GHz.

In-flange FCT is mounted in the beam line.

Short axial length, includes a ceramic gap vacuum-brazed to kovar.

Does not require bellows, wall current bypass nor electromagnetic shield.

Available from CF3“3/8 to CF8“

Bakeable up to 185°C

UHV compatible

In-air FCT installation, over the vacuum chamber Requires installation of a “gap” to prevent the wall current from flowing through the FCT aperture.

The gap can be a brazed ceramic ring or an organic material O-ring depending on the vacuum requirements.

Typical installations include bellows, a wall current bypass and an electromagnetic shield enclosing the FCT completely.